Slice of History - Dr. Henry Richter working on Explorer 1 in 1957
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War and Defense Economics Archives - Economics in the Rear-View Mirror
1957 Howe Military School Yearbook by howealumni - Issuu
Dr Henry Richter interview
Beyond the Ivory Tower The First Sixty Years 1947-2007 Sharon Hudgins by University of Maryland Global Campus - Issuu
Masterpieces from the S.I. Newhouse Collection by Christies - Issuu
Henry Richter – CEH
With Dr Henry Richter, Explorer 1 Manager, Jan 31 is the 60…
20th Century & Contemporary Art Evening Sale [Catalogue] by PHILLIPS - Issuu
Explorer 1 Pioneer Corrects Mistakes in Space.com Article – CEH
Katharine Hepburn's 20 best films – ranked!, Katharine Hepburn
